Created attachment 1216118 [details]
dnf - log and strace

Description of problem:
After running 'dnf -y upgrade && dnf -y install beakerlib' in docker with Fedora rawhide, dnf gets stuck on/after installing package python3-libs-3.5.2-6.fc26.x86_64. On f24 and f23 these commands finish successfully. I'm not sure, if the problem is in docker or fedora itself, but as it happens only on rawhide I'm more inclined to the latter variant.

Version-Release number of selected component (if applicable):
fedora-rawhide (https://hub.docker.com/_/fedora/)
docker-engine-1.12.3-1

How reproducible:
always

Steps to Reproduce:
# docker run -it --rm fedora:rawhide /bin/bash -c "dnf -y upgrade && dnf -y install beakerlib"

Actual results:
dnf gets stuck on:
Installing  : python3-libs-3.5.2-6.fc26.x86_64                                           34/49

Expected results:
dnf should finish successfully

Additional info:
I managed to get an strace log of the failing dnf command (dnf -y install beakerlib), which can be found in the attachments. 

End of the strace log:
# docker run --security-opt seccomp:unconfined -it --rm fedora:rawhide /bin/bash -c "dnf -y install strace && dnf -y upgrade && strace dnf -y install beakerlib" | tee dnf-strace.log
...
gettimeofday({1478006544, 72725}, NULL) = 0
gettimeofday({1478006544, 72750}, NULL) = 0
futex(0x7f0cdc09669c, FUTEX_WAIT, 4294967295, NULL